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How close to capacitor voltage rating?

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  • #16
    Tantalum caps can also catch fire and burn with a fury when they short out. I've seen them burn a large hole right through an FR-4 board.

    Another little-known fact: Aluminum electrolytics can't be used at high altitudes, because the end seals leak and the caps fail. I do a lot of military avionics designs and can't use anything for bulk holdup capacitance except hideously expensive hermetically-sealed electrolyics, like the CDE MLSH series. Everything else has to be ceramic or film.

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    • #17
      Originally posted by raiken View Post
      Tantalum caps can also catch fire and burn with a fury when they short out. I've seen them burn a large hole right through an FR-4 board.

      Another little-known fact: Aluminum electrolytics can't be used at high altitudes, because the end seals leak and the caps fail. I do a lot of military avionics designs and can't use anything for bulk holdup capacitance except hideously expensive hermetically-sealed electrolyics, like the CDE MLSH series. Everything else has to be ceramic or film.
      So if I'm on a jet at high altitude using my laptop and a window gets blown out on the jet, I should expect that my laptop will stop working when the e-caps blow after all the air gets sucked out of the plane? Damn, that sucks!

      Greg

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      • #18
        Originally posted by raiken View Post
        Tantalum caps can also catch fire and burn with a fury when they short out. I've seen them burn a large hole right through an FR-4 board.

        Another little-known fact: Aluminum electrolytics can't be used at high altitudes, because the end seals leak and the caps fail. I do a lot of military avionics designs and can't use anything for bulk holdup capacitance except hideously expensive hermetically-sealed electrolyics, like the CDE MLSH series. Everything else has to be ceramic or film.
        Yes.... I can also vouch for that.... If Tantalum are used in MIL applications they are 60% derated and a series resistor must be put in place to satisfy 1 ohm per volt requirement....
        No electrolytic cap...yes ..they will fall apart !!! LOL
        One document to check out is MIL-STD-1547B...

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        • #19
          Originally posted by soundmasterg View Post
          So if I'm on a jet at high altitude using my laptop and a window gets blown out on the jet, I should expect that my laptop will stop working when the e-caps blow after all the air gets sucked out of the plane?
          Look on the bright side. You'll stop working before your laptop does.

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          • #20
            You could install a macro to say something, like:

            As I lie dying on this flight
            I'll say goodbye now, if I might
            Education is what you're left with after you have forgotten what you have learned.

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            • #21
              Originally posted by Dave H View Post
              Look on the bright side. You'll stop working before your laptop does.
              Well I'd be assuming the oxygen mask would drop and I could still breathe, and hopefully the jet wouldn't crash.

              Greg

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